Which company owns MAC address prefix A4:6C:C1?

MAC address prefix A4:6C:C1 is registered to LTi REEnergy GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A4:6C:C1 has a network interface built by LTi REEnergy GmbH.

What is the OUI A4:6C:C1?

A4:6C:C1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to LTi REEnergy GmbH. It covers every address from A4:6C:C1:00:00:00 to A4:6C:C1:FF:FF:FF, or 16,777,216 addresses in total. It is also written A4-6C-C1.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in A4:6C:C1:00:00:00 that is A4:6C:C1 — and look that prefix up in the IEEE OUI registry. If the second-lowest bit of the first octet is set, the address is locally administered (a randomized or private MAC), which belongs to no manufacturer and will not resolve; modern phones and laptops use these by default on each network.

Where is LTi REEnergy GmbH located?

LTi REEnergy GmbH is listed at Heinrich-Hertz-Straße 18 Unna North Rhine-Westfalia DE 59423 in the IEEE OUI registry entry for A4:6C:C1. This is the address the organization registered with the IEEE, which may differ from its current operating address.

LTi REEnergy GmbH

MAC address prefix A4:6C:C1 is registered to LTi REEnergy GmbH in the IEEE OUI registry. Any device whose MAC address begins with A4:6C:C1 has a network interface built by LTi REEnergy GmbH. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address — it covers every MAC from A4:6C:C1:00:00:00 to A4:6C:C1:FF:FF:FF.

OUI prefix: A4:6C:C1
Hyphen form: A4-6C-C1
MAC range: A4:6C:C1:00:00:00 – A4:6C:C1:FF:FF:FF
Addresses in block: 16,777,216
Organization: LTi REEnergy GmbH
Address: Heinrich-Hertz-Straße 18 Unna North Rhine-Westfalia DE 59423
Source: IEEE OUI registry

Have a full MAC address? Look it up— we'll also tell you if it's a randomized (private) address rather than a real manufacturer prefix.

Assignment history (2)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2016-07-29Assigned to "LTi REEnergy GmbH"
archived source →
2026-07-17Assigned to "LTi REEnergy GmbH"

Nearby in the registry

The prefixes assigned immediately before and after A4:6C:C1:

FAQ

Which company owns MAC address prefix A4:6C:C1?: MAC address prefix A4:6C:C1 is registered to LTi REEnergy GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A4:6C:C1 has a network interface built by LTi REEnergy GmbH.
What is the OUI A4:6C:C1?: A4:6C:C1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to LTi REEnergy GmbH. It covers every address from A4:6C:C1:00:00:00 to A4:6C:C1:FF:FF:FF, or 16,777,216 addresses in total. It is also written A4-6C-C1.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in A4:6C:C1:00:00:00 that is A4:6C:C1 — and look that prefix up in the IEEE OUI registry. If the second-lowest bit of the first octet is set, the address is locally administered (a randomized or private MAC), which belongs to no manufacturer and will not resolve; modern phones and laptops use these by default on each network.
Where is LTi REEnergy GmbH located?: LTi REEnergy GmbH is listed at Heinrich-Hertz-Straße 18 Unna North Rhine-Westfalia DE 59423 in the IEEE OUI registry entry for A4:6C:C1. This is the address the organization registered with the IEEE, which may differ from its current operating address.